diff --git a/lib/galaxy/datatypes/test/temp2.txt b/lib/galaxy/datatypes/test/temp2.txt
deleted file mode 100644
index 2c3f803432c..00000000000
--- a/lib/galaxy/datatypes/test/temp2.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-1 2
-3 4
diff --git a/test/unit/datatypes/test_sniff.py b/test/unit/datatypes/test_sniff.py
index faf75443281..3217ae6aaf6 100644
--- a/test/unit/datatypes/test_sniff.py
+++ b/test/unit/datatypes/test_sniff.py
@@ -18,11 +18,10 @@ def assert_converts_to_1234_convert_sep2tabs(content, expected='1\t2\n3\t4\n'):
 
 
 def assert_converts_to_1234_convert(content, block_size=1024):
-    fname = get_test_fname('temp2.txt')
-    with open(fname, 'w') as fh:
-        fh.write(content)
-    rval = convert_newlines(fname, tmp_prefix="gxtest", tmp_dir=tempfile.gettempdir(), block_size=block_size)
-    actual_contents = open(fname).read()
+    with tempfile.NamedTemporaryFile(delete=False, mode='w') as tf:
+        tf.write(content)
+    rval = convert_newlines(tf.name, tmp_prefix="gxtest", tmp_dir=tempfile.gettempdir(), block_size=block_size)
+    actual_contents = open(tf.name).read()
     assert '1 2\n3 4\n' == actual_contents, actual_contents
     assert rval == (2, None), "rval != %s for %s" % (rval, content)